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PATENTED JULY 31",.1906. I

Y. WADAGAKI. SEGTIONAL WATER TUBE BOILER.

APPLICATION FILED DEO.14, 1905.

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No. 827,585. PATENTED JULY 31,.1906.

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SBGTIONAL WATER TUBE BOILER. APPLICATION mum DEO.14, 1905.

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m szmssas. PATBNTED JULY 31, 1906. Y. WADAGAKI. SEGTIONAL WATER TUBEBOILER.

APPLICATION FILED D3014, 1905.

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UNITED STATES PATENT onruon,

SECTIONAL WATER-TUBE BOILER.

Specification of Letters Patent.

Patented July 31, 1906.

Application filed December 14,1905. Serial No. 291,774.

To all whom it may concern:

Be it known that I, YASUZO WADAGAKI, a subject of the Emperor of Japan,residing at Azabu, Tokyo, Japan, have invented certain new and usefulImprovements in Sectional Water-Tube Boilers; and I do declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

My invention relates to improvements in sectional water-tube boilers;and it consists in the novel construction, combination, and arrangementof parts hereinafter described and claimed.

One object of the invention is to provide a boiler of this characterwhich will be of simple, compact, and durable construction and one inwhich the highest degree of eflioiency and economy will be obtained.

Another object of the invention isto provide a boiler of this characterin which one or more of its sections may be used as a feedwater heater.

A further object of the invention is to improve the construction andoperation of boilers of this character, and thereby render the same moreefficient and durable in use and less expensive to manufacture, clean,and re air.

The above and other objects, which will appear as the nature of theinvention is better understood, are accomplished by means of theconstruction illustrated in the accompanying drawings, in which Figure 1is a front view, partly in elevation and partly in section, of myimproved sectional water-tube boiler, showing the same mounted in afurnace-casing. Fig. 2 is a vertical sectional view taken on the planeindicated by the line 2 2 in Fig. 1. Fig. 3 is a detail vertical sectiontaken on the plane indicated by the line 3 3 in Fig. 1. Fig. 4 is a viewsimilar to Fig. 1, showing a slightlymodified form of the invention; andFig. 5 is a vertical sectional view taken on the plane indicated by theline 5 5 in Fig. 4.

Referring more particularly to Figs. 1, 2, and 3 of the drawings, thenumeral 1 denotes my improved sectional water-tube boiler, which is hereshown mounted in a furnacecasing 2 of well-known form, which comprises afire and heat chamber 3, disposed above the fire-box 4, which isseparated from the ash-pit 5 by the grate 6. The chamber 3, in which theboiler 1 is mounted, has at the rear portion of one of its sides anoutlet or stack 7, through which the smoke and products of combustionare discharged. My improved boiler 1 consists of a steam-drum 8, whichis mounted in the upper forward portion of the casing, and a pluralityof vertically-disposed sections or units 9. Each of these sections orunits 9 consists of an outletheader 10, a return-header 11, and inclinedpipes 12 12, which are connected at their front ends to said headers andat their rear ends by return-elbows. or junction-boxes 13. The headers10 11 are arranged vertically in a parallel row across the front of thecasing 3. and are in communication with the bottom of the steam-drum attheir upper ends. The headers 10 are supported at their lower ends, asshown at 14, and have their upper ends in communication with the drumthrough short pipes 15, as shown in Fig. 2 of the drawings. Thereturn-headers 11 depend from the drum 8 and are in communicationtherewith, as shown in Fig. 3 of the drawings, through shortpipe-sections 16, which aline with-flared or funnel-shaped pipes 17,arranged within said drum. The pipes 12 extend upwardly and rearwardlyfrom the headers 10, and the pipes 12 extend downwardly and rearwardlyfrom the headers 11, and the rear ends of the pipes 12 12" of each pairare con nected by the return-elbow or junction-box 13, as previouslystated, so that a circulation will be established through each of theunits 9, as indicated by the arrows. In order to permit the tubes 12 12to be readily cleaned, the headers 10 11 are formed with openings 12which aline with the ends of the said pipes to permit of the insertionof a cleaning instrument in said pipes. Said openings 12 are closed byplugs 12 or any other suitable closures. Any number of these units orsections 9 may be provided and they are preferably, but not necessarily,arranged within the casing 3, as shown, so that pipes 12 12 extendforwardly and rearwardly insubstantially horizontal planes. In order tocause the heat, smoke, and products of combustion from the fire upon thegrate 6 to take a circuitous course through the sections of the boiler,and thereby increase the eflicicncy of the same, I provide lower andupper horizontal bafiies 19 20 and lower and upper verti- I gases fromthe furnace to take a circuitous course, as indicated by the arrows inFig. 1.

In order to heat the water supplied to the boiler, I may .use one ormore of the sections or units 8 as feed-water heaters. In doing this Ipreferably use the three units which are disposed adjacent to that sideof the furnacecasing from which the heat and smoke escape to the stack 7and provide an injectorhead 24, which has nozzles 25 disposed inalinement with the pipes 15, as shown in Fig. 2 of the drawings. Thehead 24 is supplied through a suitable pipe 26, as shown. If desired,the sections or units which are used as feed-water heaters may beseparated from the remaining sections or units by a vertical partition27, which is arranged within the drum 8, as shown. When this is done, itwill be seen that the soda or'lime introduced with the feed-water forthe purpose of protecting the boiler will be retained in that portion ofthe boiler until it has accomplished its object. By feeding the boilerin this manner it will be seen that the heat contained in the escapesmoke and gases will be employed to heat the cold water, and thetemperature of the water in the other part of the boiler will not bematerially affected. The feed-water passes from the feed-heatingsections to the other seetionsby flowing over the upper edge of thepartition 27.

In Figs. 4 and 5 of the drawings the form of boiler is very similar tothat of the one just described, the only difference being that theheaders 11 instead of being made separate are formed inte ral, avertically-extending partition 28 dividing the inlet and return passages29 30 from each other, as shown. The upper ends of these double headersare in communication with the bottom of the steamdrum by means of shortpipes 31, as clearly shown in Fig. 4 of the drawings. The feedwaterinjector shown in this form of the invention has but a single nozzle 32,so that but one of the sections or units 9 is employed as a feed-waterheater.

The construction, operation, and advantages of the invention will bereadily understood from the foregoing description, taken in'connectionwith the accompanying drawings. Owing to the simplicity of theconstruction it will be seen that the boiler may be manufactured at acomparatively small cost and that it may be quickly repaired and itsparts replaced. Owing to the angular disposition of the pipes 12 12 andthe provision of the clean-out openings 12 it will be seen that the airand steam will not remain in the said pipes, the boiler may be quicklydrained, and the said tubes may be readily cleaned. The boiler is verycompact, and the use of one or more of its sections as a feed-waterheater renders it unnecessary to provide space for an extra heater andat the same time permits all of the heat from the smoke and gases to beutilized. The circulation of the water is simple and direct.

Various changes in the form, proportion,

and the minor details of construction may be resorted to withoutdeparting from the principle or sacrificing any of the advantages ofthis invention.

IIaving thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. A sectional water-tube boiler comprising sections, each consisting ofa header having a flow-passage and a return-passage arranged side byside, tubes connecting said passages of the headers, a steam-drum abovethe headers, tubes connecting the passages of the headers to thesteam-drum, those tubes which connect the flow-passages to the steamdrumhaving their upper ends open at the bottom of the drum and those tubeswhich connect the return-passages to the drum extending upwardly in thelatter and terminating and discharging thereinto at a point above thebottom thereof, and pipes extending into the drum and havinginjector-heads disposed above the upper ends of the flow-passages of theheaders and discharging downwardly into said flow-passages,substantially as described.

2. A sectional water-tube boiler having sections, each consisting of aheaderhaving a flow and a return passage, arranged side by side, andwater-tubes connecting said passages, one of said passages extendingbelow the other at the bottom of the header and having its upper endlower than that of the other, and upper and lower baffles arranged inalternation and respectively disposed between the upwardly-projectingand downwardly-projecting portions of the passages of adjacent headers.

3. A sectional water-tube boiler having sections, each consisting of aheader having a flow-passage and a return-passage, the upper end ofv thereturn-passage extending plurality of water-circulating sections"'ar--ranged side by side, a furnace casing inclosing said sections,substantially horizontal In testimony whereof I have hereunto setbaffles arranged in alternation at the upper my hand inpresence of twosubscribing witand lower sides of the sections, and verticallynesses.

disposed baflies arranged in alternation be- YASUZO WADAGAKI. 5 tweencertain of the sections and disposed Witnesses:

respectively at the upper and lower sides GENJI KIiRIBARA,

thereof, substantially as described. K. TOYODE.

